Stare at the four black dots in the center of the image for 30 - 60 seconds.
Then quickly close your eyes and look at something bright (like a lamp or a window
with sunlight coming through it). You should see a white circle with an image inside it.

 

 

 

 

 

Are the lines below straight or are they curved?

 

Try putting a straight edge against the lines on your screen to test your conclusion.

 

 

 

 

 

 

 

How many legs does this elephant have?

 

 

 

 

What do you see below?

 

A lady or a musician? See both?